UE in UERANSIM is unable to connect the Open5gs where every NFs has their TLS enabled: [nas] [error] Initial Registration failed [UE_IDENTITY_CANNOT_BE_DERIVED_FROM_NETWORK]

[timamghosh30]

Dear community,

Recently, I deployed Open5gs with UERANSIM on Ubuntu. I deployed Open5gs using 'apt' and UERANSIM by compiling the UERANSIM source codes. The details of the deployments are as follows,

UERANSIM

• Version: 3.2.6
• Tutorial followed for Installation: https://github.com/aligungr/UERANSIM/wiki/Installation

Open5gs

• Version: 2.7.1
• Tutorial followed for Installation: https://open5gs.org/open5gs/docs/guide/01-quickstart/

OS

• Ubuntu 22.04.4 LTS (installed as VBox Virtual Machine)
• Core: 5
• RAM: 8192 MB
• Storage: 100 GB
• Proxy: configured with institute proxy

Due to the requirements of my project, I need to enable the TLS feature of the network functions (NFs) in Open5gs. Before enabling the TLS feature in every NFs in Open5gs, I tested the UERANSIM with Open5gs. In this case, the UE in UERANSIM was able to establish the PDU session and create the uetunsim0 interface.

Thereafter, I changed the config files of each NF in Open5gs, located at /etc/open5gs/, to enable the TLS feature. After changing these config files, I used Wireshark to observe the communications among the NFs. In this context, I observed that the NFs communicate among themselves over TLS. But, I tried to test UERANSIM with TLS-enabled Open5gs, and the UE in UERANSIM could not establish the PDU session. The logs and modified config files are as follows,

• Config logs pcap.zip

UE output:

gNB output:

UE registration details using WebUI:

My observation:

• The issue occurs after enabling the TLs feature on Every NFs in Open5gs. Without enabling the TLS, the UERANSIM works fine with Open5gs.
• In the log of AMF, it shows that, due to HTTP bad response [500] the UE registration request is rejected
• In SCP, the logs show a problem with AUSF. There is also some problem with the SEPP.
  

As I am a novice in the domain of Open5gs and UERANSIM, I am not sure whether I misconfigured the NFs or the UERANSIM that creates these issues. Could you please help me out?